Social Bookmarking

Social bookmarking is a means for people to share items of interest with others, without having to provide the full text of an item or explain it fully. Services such as Delicious, Reddit, and Digg are examples of social bookmarking sites that allow users to tag news and other items to indicate to others that they found the items interesting and/or informative. The main difference between such services and search engines is the source — humans rather than algorithms, which brings a different perspective and added value, but also limitations on scope and opportunities for fraud and misuse.